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I think you’re slightly misunderstanding what it does. During normal drive operation, in gears 1-3 the OD section is only relying on the roller clutch. That is what’s prone to failure, and what causes the catastrophic failures. When you shift to 3,2,or 1 manually it uses the overrun clutch as...

Ahh, I see, you were talking about exhaust/engine braking. I was simply saying there was something available to prolong the life of the OD components while providing normal off throttle engine braking. I wasn’t even thinking of exhaust brake because they are extremely uncommon on 6.5TDs. not...

Not entirely true. I found this available from sonnax. It applies the overrun clutch at all times except OD in order to strengthen the overdrive roller clutch. Also makes it so gears 1-3 have engine braking while in D. I put it in the transmission of my Suburban...

Is it very small? I haven’t been able to find pictures of what it should look like anywhere.

Could anyone tell me how to visually identify the optimizer? Does it actually look any different from the standard 6.5? Could the engine from my 99 suburban have been one? I bought an optimizer from GEP and want to make sure I got what I payed extra for.